Figure 4. LC-MS/MS BVIX isomer fragmentation patterns for PAO1 ΔphuS strain supplemented with 5 μM 13C-heme.
(A) HPLC analysis of BV isomers following extraction from the extracellular media. BVIX isomer peaks as marked. *Indicates a non-BVIX contaminant; (B) MS/MS fragmentation of 13C-BVIXα (red line) and 12C-BVIXα (black); (C) As in (B) for BVIXδ; (D) As in (B) for BVIXβ. LC-MS/MS was performed as described in the Methods with multiple reaction monitoring.